Antiager



Patented Dec. 30, 1941 ANTIAGER Philip T. Paul, Naugatnck, Conn., assignor to United States Rubber Company, New York, N. Y., a corporation oi New Jersey No Drawing. Application October 28, 1938, Serial N0. 237,465

Claims.

This invention relates to a new class of deterioration retarders.

An object of the invention is to provide a new class of anti-oxidants or age resistors for organic substances which tend to deteriorate by absorption of oxygen from the air, for example, goods of rubber or allied gums, unsaturated fatty oils such as unsaturated vegetable oils, essential oils, petroleum oils and their derivatives such as gasolines, soaps, aldehydes, synthetic resins, turpentine, paints and varnishes containing d ying oils, and the like. A further object of the invention is to provide chemicals which additionally act as flex improvers or anti-flex cracking agents for vulcanized rubber such as tire treads which undergo repeated strains during use. Further objcts will be apparent from the following description.

According to the invention, the organic substance is treated with a 1-nitroso-2,2,4-trialkyl- 1-2 dihydro quinoline having the general formula alkyl where n is one or a multiple of one as in the case of a polymer. The benzene nucleus may be unsubstituted or substituted in one or more of the positions 5, 6, 7, 8 as by alkyl, aryl, aralkyl, halogen, hydroxy, alkoxy, aryloxy, benzo, alkenyl, primary amino, secondary alkyl substituted amino, tertiary alkyl substituted amino, secondary aryl substituted amino, tertiary aryl substituted amino, mercapto, nitro, etc. Examples of such radicals are methyl, phenyl, benzyl, chloro, hydroxy, methoxy, ethoxy, phenoxy, isopropenyl, amino, methyl amino, dirnethyl amino, anilino, diphenylamino, mercapto, nitro.

Among such examples are l -nitroso-2,2,-trimethyl- 1,2

quinoline 1-nitroso-2,2,-trimethyl-1,2

quinoline l-nitroso-2,2,-trimethyl-1,2

(polymerized) 1-nitroso-2,2,4=-trimethyl-1,2 dihydro 6 methyl quinoline 1-nitroso-2,2,4-trimethyl-1,2

quinoline l-nitroso-2,2,4-triethyl 1,2 dihydro 8 hydroxy quinoline dihydro 6 ethoxy dihydro 6 phenyl dihydro quinoline dihydro 7 anilino 1-nitroso-2,2,4-trimethyl 1,2 dihydro 4 chloro quinoline The following is given in illustration of the preparation of the chemicals:

(A) PREPARATION or 1-N1rnoso-2,2,4-TB1METHYI,-1,2 Dmrpao-G-Ernoxr QUINOLINE 2,2,4-trimethyl-1,2-dihydro-6-ethoxy quinoline (29 grams) is dissolved in a mixture of 25 cos. dioxane and 20 ccs. glacial acetic acid, and the solution cooled in an ice bath to 5 C. With stirring a solution of 10.65 grams of 95% sodium nitrite in a minimum amount of water is slowly run in. The temperature is not allowed to rise above 10 C. After all the sodium nitrite has been added the mixture is allowed to stand for an hour. Approximately a liter of water is added and the nitroso body extracted with ether. The ether solution is washed, dried and the ether removed by heating in vacuo on a water bath held at 50-60 C. The residue, a deep red syrup consisting essentially of 1-nitroso-2,2,4-trimethyl- 1,2 dihydro-6-ethoxy quinoline, is suitable for use in rubber.

(B) PREPARATION or 1-NITBOS0-2,2,4-TRIMETHYL-1,2 DIHYDBO-QUINOLINE (POLYMEBIZED) Polymerized 2,2,4-trimethyl-L2 dihydro-quinoline (36.6 grams) is dissolved in a mixture of ccs. dioxane and 25 ccs. glacial acetic acid, and treated as described above with 16 grams sodium nitrite. The residue from the ether evaporation on standing becomes a brittle mass melting 75-80 C. It consists essentially of polymerized l-nitroso-2,2,4-trimethyl-1,2 dihydro quinoline and is suitable as such for use in rubber.

(C) PREPARATION or 1-NITRoso-2,2,4-TmMETHYL-1,2 DIHYDRo-G-PHENYL QUINoLINE 2,2,4-trimethyl-L2 dihydro-G-phenyl quinoline (25 grams)- is dimolved in a mixture of 50 ccs. dioxane and 25 ccs. glacial acetic acid, and the solution cooled to 5 C. 'With stirring a solution of 8.3 grams of sodium nitrite in a minimum amount of water are slowly added. The temperature was not allowed to rise above- 10 C. Towards the end of the addition of the sodium nitrite, the nitroso derivative separated out. Stirring was continued for half an hour after all the sodium nitrite had been added. The crude nitroso body was filtered ofi and recrystallized from alcohol. It forms bright yellow crystals, melting 98-99 C.

The efi'ectiveness of the chemicals of this class for retarding the oxidation of rubber is illustiii i i i m as 2 v I i :1 tie rubber as the; parts being .1;

snimi i i we wmp un the resiil j hours under :a'eo

i l wsz 2g quinoline hyd o 1) sic Unaged Aged Stocks containing the above mentioned antioxidants are also superior to the control inresisting deterioriation due to flex-cracking and to ageing at 100 C.

Incident to their use in the materials may be used as contr dation to regulate the rate of drying of which dry by oxidation.

The invention may be applied for the preservation of natural and artificially-prepared rubbers, unvulcanized or vulcanized, including reclaims and latices of such rubbers.

It is also to be understood that other desired filling and compounding ingredients may be incorporated along with the preservative, for example, in the case of rubber, there may be incorporated other accelerators, softeners, etc.

The antioxidant may be incorporated in any type of rubber composition, such as those used for automobile tires and tubes, hose, belting,

paints and varnishes,

ollers oi oxifinishes sheet and thread rubber, rubberized fabrics,

ma er l o wmc rub e e t a be dissoivedl there sioins or solur i r 3 o i f poration crmnvulcanized rubb wh Et n ea 2 1 4 8 man; 1 5 io ein ti itdsa dded The antic by diffusion, 15 1;

phenyl quinoline.

trialkyl-L2 dihydro quinoline '7. An organic substance r? in; 1:1. he z ni s nt may in n winning nsa Q a, an em belmveri d u sa aswmmm 993 f nca bi afl mpowdi r. 01* applied $116k: i

s Or nic s bs a c te' oratei syiabe me n r on,

"cihf com i e m m ria ize trimethyl we -i w t e steam; whic an.

It the T 3. i liquid; 5 4 1 pa t 5 11 11 is ior incor e: surfaces ;of er i 1 ,2 dihydro-fiwhich tends to deoxygen from the ail ted a l-nitroso-2,2,4-

which tends to del-nitroso-2,2,4-trialkyl-1,2

8. An organic substance teriorate by absorption of in which has been incorporated 1-nitroso-2,2,4

trimethyl-l,2 dihydro-G-ethoxy quinoline.

9. An organic substance teriorate by absorption of dihydro quinoline.

which tends to de oxygen from the ai which tends to de oxygen fromthe al in which has been incorporated 1-nitroso-2,2,4

trimethyl-1,2 dihydro quinoline.

10. An organic substance which tends to de teriorate by absorption of in which has been incorpo oxygen from the a: rated 1-nitroso-2,2,4

trimethy1-1,2 dihydro-G-pheny'l quinoline.

PHILIP '1. PAUL. 

